import java.util.*;

/**
 * This program demonstrates a <code>for</code> loop.
 * 
 * @version 1.20 2004-02-10
 * @author Cay Horstmann
 */
public class LotteryOdds {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);

		System.out.print("How many numbers do you need to draw? ");
		int k = in.nextInt();

		System.out.print("What is the highest number you can draw? ");
		int n = in.nextInt();

		/*
		 * compute binomial coefficient n*(n-1)*(n-2)*...*(n-k+1)/(1*2*3*...*k)
		 */

		int lotteryOdds = 1;
		for (int i = 1; i <= k; i++)
			lotteryOdds = lotteryOdds * (n - i + 1) / i;

		System.out
				.println("Your odds are 1 in " + lotteryOdds + ". Good luck!");
	}
}
